Underfeed stoker



April 15, 1930. R. L. BEERS I UNDERFEED STOKER Original Filed Jan. 19, 1925 5 Sheets-Sheet 1 SJ" ucnl'oz 720% Z]. 366/5 6 M Qflouww.

April 15, 1930. R. L. BEERS UNDERFEED STOKER 5 Sheets-Sheet 2 Original Filed Jan. 19, 2

Patented Apr. 15, 193

ROYCE I. BEERS, OF DETROIT, MICHIGAN, ASSIGNOR TO DETROIT STOKER COMPA,

OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN UNDERFEED STOKER Application filed January 19, 1925, Serial Ito. 3,521. B enewed October 2, 1929 This invention relates generally to stokers having mechanism for feeding fuel into and through the usual retorts and consists of novel and efficient driving "mechanism in which provision is made exteriorly of the furnace for the adjustment of such feeding mechanism for regulating the movement of fuel thereth'rough.

In the accompanying drawings:

Figure 1 is a verticalcentral longitudinal section through a stoker embodying my invention;

Figure 2 is a cross sectional view taken on the line 22 of Figure 1;

Figure 3 is a side elevation of one of the sectional bearings;

Figure 4 is an end elevation thereof;

Figure 5 is a side elevation of one of the pitman rods and showing the links connected 2o thereto;

Figure 6 is a top plan view of the construction shown in Figure 5;

- Figure 7 is a front elevation of the adjusting block and collar that are adapted to be mounted upon one ofthe pitmanrods;

Figure 8 is an end View of the construction shown in Figure 7 e Figure 9 is a detail view of one of the rods carried by the pitman rods; v

Figure 10 is a detail side elevation of the rear adjusting block;

Figure 11 is an end elevation of the block shown in Figure 10;

Figure 12 is a detail view of the rear retaining pin;

Figure 13 is a detail of the forward retaining pin;

Figure 14 is a detail View of the pin sliding in the pitman rod;

Figure 15 is a top plan view of one ofthe rams. In the drawings, 1 designates a series of laterall spaced retort-s into which green fuel is fed from suitable hoppers 2 supported in front of the furnace upon casings 3 in alignment with the retorts 1. The green fuel may be su plied by any suitable means (not shown to the hoppers and fed into the re torts by suitable rams 4 mounted in the casings 3, These rams are reciprocated by pitare operated.

man rods 5 having substantially rectangular shaped heads 6 at their outer ends through which relatively long rods 7 preferably extend. These rods project above and below the crank portions 8 of a rotary shaft 9 in front of the furnace and support suitable blocks 10. Loosely mounted on the crank portions 8 of this shaft are sectional bearings 11, which are preferably sleeved upon the rods 7 between the heads 6 and the blocks 10. The halves of these bearings may be secured together by bolts or the like 11. Any suitable means such as the nuts 12 threade'dly engaging the inner ends of the rods 7 may-be used for securing the rods to the pitman heads 6, while suitable inverted L-shaped pins 13 are preferably used to hold the blocks 10 on the rods 7. As shown, these pins 13 preferably extend through aligned openings 14 in the blocks 10 and are engage-- able with suitable openings 15 spaced longitudinally of the rods 7. Thus, the blocks 10 may be adjusted longitudinallyof the rods 7 to provide variable lost motion for changing the positions to which the rams may be 7 moved at the end of their backward strokes.

If desired, the rams 4 may be adjusted to their advanced position where the act as cut-ofis for the hoppers 2. To acilitate such adjustment, the blocks 10 are first so moved to the outermost position onthe rods 7, after which rotation of the crank shaft 9 will push the rams 4' forward, but will not return the same as the clearance or lost motion is equal to the full stroke. Inasmuch as there are' separate connections between each ram and the crank shaft 9, it is readily apparent that any one of the rams may be left in cut-ofi' position while the other rams For advancing the fuel longitudinally of the retorts, I have rovided suitable wedgeshaped pusher bloc s 17 mounted on pusher bars 18 having short extensions 21 extending through the heads 22 of the rams 4 and connected at their rear ends to parallel links 23 26 in adjusted position, I preferably provide suitable pins 31 that are engageable with the openings 32, 28 and 27 respectively in the collars 29, rods 5 and blocks 26. Thus, the blocks may be adjusted longitudinally of the pitman rods 5 to provide variable lost motion for changing the positions to which the pusher blocks 17 may be moved at the end of their backward strokes. Inasmuch as the links 23 are connected to the pitrnan rods 5, it will be readily apparent that the positions to which the. pusher blocks 18 maybe moved at the end of the backward strokes of the rams may be correspondingly changed by adjusting the blocks 10. If desired, both the rams and pusher blocks of any retort may be rendered inoperative while the others are operating by adjusting the blocks 10 to the rear ends of the rods 7 to permit the bear-' ings 11 to slide freely upon the rods 7. Moreover, the length of the slots 25 in the pitman rods-5 is such that the blocks 26 may be adjusted forwardly a sufficient distance to permit the pins 24 to travel freely in the slots 25 without actuating the pusher hare.

18; thus the pusher blocks 17 may be rendered inoperative by adjusting either the blocks 10 or the blocks 26. Inasmuch as both the blocks 10 and 26 are positioned ex- .teriorly of the furnace, the supply of fuel and the advancement thereof in the retorts ma be convenientlyregulated as desired -wh1le the stoker is operating for obtaining the proper fuel bed.

What I claim as my invention is:

1. In a stoker, the combination with a retort, a ram for feeding fuel into the retort, and a pusher block for advancing fuellongitudinally of the retort, of a rotary. drive shaft, a pitrnan rod for reciprocating said ram operatively connected to said shaft, 2. bar for actuatin said pusher block, a link connected to said er, a pin carried by the link slidably on aging said pitman rod, and means adjustabledongitudinally of the pitman rod adapted to he engaged by said pin for regulating the positions to which said pusher block may be moved at the end of the hackward strokes of the 2. In stoker, the combination with a retort, a ram for feeding fuel into the retort,

a pusher block for advancing fuel longitudinally of the retort, of a rotary drive shaft,

a pitman rod for reciprocating said ram 0peratively connected to said shaft, a bar for actuating said pusher block, an extension for the bar movable through the ram, and a link for actuating the bar connected to the extension and pitman rod.

3. In astoker, the combination with a retort, and a ram for feeding fuel into the retort, of driving mechanism for the ram including a rotary crank shaft, a pitman rod connected to the ram having a head, spaced rods carried by the head, a l mounted on the spaced rods, a bearing loosely mounted .on a crank portion of said shaft slidably mounted on said spaced rods between the head of the pitman rod and said block, and removable means engageable with said spaced rods for holding said block in adjusted position...

4. In a stoker, the combination with a retort, a ram for feeding fuel into the retort, and a pusher bar for advancing fuel through the retort, of a rotary crank shaft, a pitman rod for reciprocating said-ram operatively connected to said shaft, a link connected to saidpusher bar, a pin carried by said link slidably engaging a slot in said pitrnan rod, and means adjustable longitudinally of said pitman rod adapted to be engaged by said pin for'regulating the extent of movement of said pusher bar.

5. In a stoker the combination with a retort and a ram for feeding fuel thercinto, of a drive shaft, a pitman rod connecting the drive shaft to the ram and a pusher within the retort adjustably connected to the pitman rod in the line of thrust thereof and intermediate said shaft and ram.

6. In a stoker mechanism of the class described, the combination with a retort and a ram for feeding fuel thereinto, of a drive shaft, a pitlnan rod connecting said shaft to said ram, a pusher within the retort and means connected thereto and extending without the retort for adjustably connecting said pusher to said pitman rod in substantially the line. of thrust thereof and at a point intermediate the shaft and rain.

7. In a stoker mechanism of the class described, the combination with a retort, of a ram'member for feeding fuel thereinto, an operating member for reciprocating the ram, a pitman directly connecting said members and exerting an axial thrust upon the ram. 21 pusher within the retort and an adjustable connection between the pusher and pitman in the line of thrust of the latter and exteriorly of the ram.

In testimony whereof affix my signature.

CE L. BRIEFS. 

